Comparison of dynamic tensile extrusion behaviour of WCu composites made by different processes

Abstract

Composites with 60~90% of tungsten are used in liners of some specialty shaped charges. The penetration is enhanced by a factor against copper for homogeneous steel target. Tungsten powder based shaped charge liners are also especially suitable for oil well completion. In this study, WCu composites manufactured by different process are used for testing of dynamic tensile extrusion (DTE) behaviour. One samples were made by copper infiltrated method. The other samples were manufactured by metal injection molding methods with reduced tungsten copper composite powder. DTE tests were carried out by launching the sphere samples (Dia. 7.62mm) to the conical extrusion die at a speed of ~375m/s. The DTE fragmentation behaviour of tungsten copper composites after soft-recovered were examined and compared with each other.

Dynamic Tensile Extrusion Behavior of Fine-Grained Copper Fabricated by Powder Injection Molding

“…where l i is the longitudinal length of the i th fragment and l 0 is the initial diameter of the projectile. The condition of the DTE test is similar to the jet formation of the shaped charge mentioned above; therefore, the DTE ductility was applied to evaluate the jet formability of several liner metals and alloys [4][5][6][7][8][9]. It has been reported that the DTE ductility of oxygen-free high-conductivity Cu under the same projectile velocity increases with a decrease in the grain size in the coarse grain (CG) range over 10 µm as a result of grain refinement and dual <001> + <111> texture development [4][5][6].…”